/in/foo.cc: In function 'int main()':
/in/foo.cc:42:6: warning: unused variable 'l' [-Wunused-variable]
  int l=quj[1].a,r=quj[n].b,fr1=-1,fr2=-1;
      ^
/in/foo.cc:42:17: warning: unused variable 'r' [-Wunused-variable]
  int l=quj[1].a,r=quj[n].b,fr1=-1,fr2=-1;
                 ^
/in/foo.cc:42:28: warning: unused variable 'fr1' [-Wunused-variable]
  int l=quj[1].a,r=quj[n].b,fr1=-1,fr2=-1;
                            ^~~
/in/foo.cc:42:35: warning: unused variable 'fr2' [-Wunused-variable]
  int l=quj[1].a,r=quj[n].b,fr1=-1,fr2=-1;
                                   ^~~